Enum SignCountVerdict 

pub enum SignCountVerdict {
    NoBaseline,
    NoCounter,
    Increased,
    Equal,
    Decreased,
}

What a sign-count comparison says, independent of any policy.

WebAuthn L3 §7.2 step 18 is explicit that a counter which does not increase is “a signal, but not proof”, and it names one benign cause: “a race condition where the Relying Party is processing assertion responses in an order other than the order they were generated.” So the comparison itself yields a fact; what the relying party does about it is a separate decision, and this enum is the first half.

Variants

NoBaseline

The stored counter was zero, so there is no baseline: first use, or an authenticator that has never signed.

NoCounter

The reported counter was zero, so the authenticator implements no counter and the assertion carries no freshness signal either way.

Increased

The counter strictly increased. Fresh.

Equal

The counter is unchanged — which is exactly what a replayed assertion looks like, since it carries the value the authenticator last wrote.

Decreased

The counter went backwards.

Implementations

impl SignCountVerdict

pub fn is_regression(self) -> bool

Whether this verdict is a counter regression — L3’s “signal”.

pub fn is_fresh(self) -> bool

Whether the assertion may proceed under a policy that treats regressions as signals.

Trait Implementations

impl Clone for SignCountVerdict

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SignCountVerdict

impl Debug for SignCountVerdict

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for SignCountVerdict

impl PartialEq for SignCountVerdict

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SignCountVerdict